1,206 reputation
411
bio website marty-green.blogspot.com
location Canada
age
visits member for 3 years, 7 months
seen 7 hours ago

Apr
23
awarded  Yearling
Apr
5
answered What are the various physical mechanisms for energy transfer to the photon during blackbody emission?
Apr
5
comment What are the various physical mechanisms for energy transfer to the photon during blackbody emission?
I would think that in a metal, the conduction electrons would form more or less a stationary cloud, while the lattice vibrations would consist of the metal ions, accompanied by most if not all of their tightly bound electrons.
Apr
5
comment What are the various physical mechanisms for energy transfer to the photon during blackbody emission?
Yes, you are right, the lattice vibrations in a solid radiate just like an antenna. I think it's true that all of the thermal radiation properties of matter can be analyzed by finding the time-varying charge density (which is in principle calculable using quantum mechanics) and then just applying Maxwell's Equations to calculate the resulting radiation.
Mar
29
comment A charged sphere with pulsing radius
The other contributors so far have tried to give hints without giving away the answer, so I'm going to do the same. This problem is actually a physical description of a hydrogen atom in a superposition of the 1s and 2s states. There is a time-varying charge density in this superposition, and it is pretty much exactly what the problem here describes.
Mar
8
answered How to get the angle needed for a projectile to pass through a given point for trajectory plotting
Mar
6
answered Bessel vs. modified Bessel in radial equation of hydrogen
Mar
2
revised Solving the diffusion equation
added 174 characters in body
Mar
2
answered Solving the diffusion equation
Feb
28
comment What was Albert Einstein's proof for $E=mc^2$?
Yes, Ron is probably out of his mind but he still knows more physics than ten anna vs and four dmckees put together.
Jan
31
answered How can I stand on the ground? EM or/and Pauli?
Jan
31
comment How can I stand on the ground? EM or/and Pauli?
Actually, I think Ron Maimon is right.
Jan
24
answered Counting electromagnetic modes in a rectangular cavity and boundary conditions
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@MikeDunlavey I stumbled across Denker's website about seven or eight years ago and it made a huge impression on me.
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@mike Thanks Mike. I'm not used to people agreeing with me.
Jan
18
comment How much effect does the Bernoulli effect have on lift?
It is equally true that all the lift depends on the change in airflow direction. You have to calculate one or the other but not both.
Jan
18
comment Can light be canceled by merging with an inverted wave?
@EduardoGuerras Acutally I did downvote and then regretted it. I think it's more important to leave the upvotes as evidence of the quality of voting that goes on here.
Jan
18
comment Can light be canceled by merging with an inverted wave?
Eduardo you are so right.
Jan
16
revised Radiated power and energy density for a black-body
added 680 characters in body
Jan
16
revised Radiated power and energy density for a black-body
added 1151 characters in body